Release v0.5.0-beta.3

[sbaker]

Summary

• Agent chat modes with backend-driven mode definitions (agent, planner, help-chat, brainstorm)
• IntelliSense enhancements: multi-tab model-file mapping, cross-reference fixes, code action improvements
• In-app auto-update banner replacing native OS dialogs (dismissable, re-shows on new version)
• ChatTab provider/model selector visible in embedded/split-editor mode
• Anthropic thinking mode: force temperature=1, silently disable for unsupported models
• CLI compiler fixes: inherited parameter defaults with type coercion, {% include %} path resolution for inherited prompds
• Registry sync uncaught promise rejection fix
• Switched all packages from file: symlink to npm @prompd/cli@0.5.0-beta.6
• Removed dead bcrypt/password code from CLI (fixed Electron rebuild failures)
• License correction to ELv2, URL fixes, dependency upgrades

Test plan

• Verify auto-update banner appears on new version detection (downloading state -> ready to install)
• Verify dismiss works and banner re-appears on new update event
• Verify ChatTab shows provider/model selector in split-editor preview mode
• Verify thinking mode works on supported models (claude-3.7+) and silently skips unsupported
• Verify inherited prompds compile correctly with {% include %} and parameter defaults
• Verify Electron build succeeds without bcrypt native module errors
• Verify registry connection failures don't produce uncaught promise rejections

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